Create changingpassword.md

Signed-off-by: Kjeld Schouten <kjeld@schouten-lebbing.nl>

charts/premium/nextcloud/docs/changingpassword.md

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+---
+title: Changing Database Password
+---
+
+Sadly enough, Nextcloud Containers do not correctly update database passwords when changed.
+To do so, please execute the following steps to do so manually:
+
+## Other Platforms
+
+Due to other platforms do all having the same storage backend, it depends on your storage backend how you do this.
+It might be advisable to change the password within nextcloud *before* changing the password on the cnpg database.
+
+In summary:
+- Access the config PVC
+- Edit config.php to ensure "dbpassword" reflects your password
+
+## TrueNAS SCALE
+
+1. Mount Nextcloud with HeavyScript, ex:
+heavyscript pvc --mount nextcloud
+
+2. Change to the mounted path, then to the nextcloud-config folder, ex:
+cd /mnt/mounted_pvc/nextcloud/nextcloud-config
+
+
+3. grep out dbpassword, ex:
+cat config.php | grep "dbpassword"
+
+
+4. Copy the value from the grep command, should look something like: dF6h35JFX5v6AzfFpviFAoBbZU9cghKrwHWJf9GY5oRmYJEaiTHkYz93JPUgRf
+Change to your home directory, or exit the terminal, ex:
+cd ~
+
+
+5. Unmount Nextcloud with HeavyScript, ex:
+heavyscript pvc --unmount nextcloud
+
+
+6. Open TrueNAS UI > Apps > Nextcloud > Edit, and scroll down to the CNPG section and replace PLACEHOLDERPASSWORD under the password field, with the grep value (from step 3-4), then save
+If a failure happens here regarding cannot upgrade between pg versions then change the Postgres Version under CNPG settings to 15 if its 16 and attempt to save again
+
+7. Start with heavyscript, ex:
+heavyscript app --start nextcloud